Some are going off near me now. Isolated stuff though. I expect it will tail off through this week.
It's the money involved. They start selling them so early in the big shops.
We also get them for religious festivals but I've always found they are very respectful. They stick to the nights in question and it's a short blast around early evening.
The idiots letting off at 3am after the pub are annoying but we seem to get less of them nowadays.